For example I have FiOS which is a MoCA router and with an Elite/XL4, I would not need to use Ethernet or wireless for any connections; I would only connect the Coax cable and this box would be able to talk to other devices on my home network as well as download software updates and movies and such.

I've been reading with interest the various threads around here pertaining to MOCA (media over cable).

What I keep missing, though, is any discussion of how one could control a device remotely. Shouldn't that be possible?

In other words, if you have a TiVo in one room of the house, is there a way of

1) using MOCA to see its contents on a TV in another room? and

2) to control it remotely (i.e., Now Playing, pick shows to watch, etc.)?

Hope this makes sense.

My suspicion is that some sort of IR extender, remote device would be needed for #2; unsure about what's needed to set up #1.

It is possible. MoCA is working on Multi Room DVR. With that you can view what is playing or recording on other DVR or TiVo. With MoCA Ethernet you can bridge or supply network and multimedia connectivity to a TV, computer, game console, laptop, etc. Devices with integrated MoCA support can interface directly without the use of an adapter.